Pausanias Description of Greece 2.15.5

[5] There is also another tale [ logos] told [ legesthai] that goes like this… that Phoroneus was the first to be born in this land, and that Inakhos, the father of Phoroneus, was not a man but the river. This river, with the rivers Kephisos and Asterion, arbitrated [ dikazein] concerning possession of the land between Poseidon and Hērā. They decided [ krinein] that the land belonged to Hērā, and so Poseidon made their waters disappear. For this reason neither Inakhos nor either of the other rivers I have mentioned provides any water except whenver the god [= Zeus] makes rain. In summer their streams are dry except for those at Lerna. Phoroneus, the son of Inakhos, was the first to gather together humans [ anthrōpoi] into a commonality [ koinon], who up to that time had been scattered and living-in-settlements[ oikeîn] all by themselves. The place into which they were first gathered was named the City [ Astu] of Phoroneus.